Exhaust system and saddle-ride type vehicle

Abstract

An exhaust system for a saddle-ride type vehicle provides sufficient volume in a chamber while avoiding interference between the chamber and other parts. The vehicle center of gravity is lowered and differences in exhaust pipe length are reduced. Exhaust pipes are connected to combustion chambers of front and rear cylinder banks of a V-type engine. A chamber is connected to the exhaust pipes and mufflers are connected to the chamber. The chamber has an exhaust pipe connection wall to which the exhaust pipes are connected and opposing muffler connection walls. The mufflers are connected to positions on the muffler connection walls closer to the engine relative to a center in a longitudinal direction of the vehicle.

1. An exhaust system for a saddle-ride vehicle having an engine, a front cylinder bank and a rear cylinder bank, comprising:
 exhaust pipes connected to the front and rear cylinder banks; 
 a pivot shaft configured to serve as a center of rotation of a support member that swings and supports a rear wheel in a vertical direction; 
 a chamber for exhaust gases comprising an exhaust pipe connection wall facing a rear wall in a vehicle longitudinal direction, wherein ends of all of the exhaust pipes are connected to the exhaust pipe connection wall, and a pair of muffler connection walls opposed in a vehicle width direction, wherein the chamber is behind the pivot shaft; and 
 mufflers connected to positions on the muffler connection walls that are closer to the engine than a center in the longitudinal direction of the vehicle. 
 
   
   
     2. The exhaust system according to  claim 1 , wherein
 the front cylinder bank is farther from the exhaust pipe connection wall than the rear cylinder bank, and 
 ends of exhaust pipes connected to the front cylinder bank are connected to side portions of the exhaust pipe connection wall in a vehicle width direction, and ends of exhaust pipes connected to the rear cylinder bank are connected to center portions of the exhaust pipe connection wall in the vehicle width direction. 
 
   
   
     3. The exhaust system according to  claim 1 , wherein
 the front cylinder bank is farther from the exhaust pipe connection wall than the rear cylinder bank; and 
 ends of exhaust pipes connected to the rear cylinder bank are connected to the exhaust pipe connection wall at positions more distant from each other than positions from each other to which ends of exhaust pipes connected to the front cylinder bank are connected. 
 
   
   
     4. The exhaust system according to  claim 1 , wherein
 the front cylinder bank is farther from the exhaust pipe connection wall than the rear cylinder bank; and 
 exhaust pipes connected to the rear cylinder bank have intermediate portions that intersect. 
 
   
   
     5. The exhaust system according to  claim 1 , wherein
 the front cylinder bank is farther from the exhaust pipe connection wall than the rear cylinder bank; and 
 exhaust pipes connected to the rear cylinder bank have intermediate portions that intersect; and 
 ends of exhaust pipes connected to the rear cylinder bank are connected to the exhaust pipe connection wall at positions more distant from each other than positions from each other to which ends of the exhaust pipes connected to front cylinder bank are connected. 
 
   
   
     6. The exhaust system according to  claim 1 , wherein the mufflers are connected to positions on the muffler connection walls that are higher than a center of the chamber in a vertical direction. 
   
   
     7. The exhaust system according to  claim 1 , wherein the muffler connection walls are curved convexly toward an outside of the chamber and the mufflers are connected to positions on the muffler connection walls that are higher than a maximum projection of the chamber in a width direction. 
   
   
     8. The exhaust system according to  claim 1 , wherein the rear wall of the chamber is opposed to the rear wheel. 
   
   
     9. A saddle-ride vehicle comprising the exhaust system according to  claim 1 . 
   
   
     10. A saddle-ride vehicle comprising the exhaust system according to  claim 2 . 
   
   
     11. A saddle-ride vehicle comprising the exhaust system according to  claim 4 . 
   
   
     12. The exhaust system according to  claim 1 , wherein the mufflers comprise a cylindrical-shaped body substantially in the form of a frustum increased in diameter toward the rear the rear wall of the chamber. 
   
   
     13. The exhaust system according to  claim 1 , wherein the chamber comprises an expansion chamber having a peripheral wall portion; and a reinforcement plate for the reinforcement of the peripheral wall portion and the muffler connection walls. 
   
   
     14. The exhaust system according to  claim 13 , wherein a plurality of different-sized vent holes are formed on the reinforcement plate.